linux-stable.git/drivers/nvmem/core.c, branch v5.8 Linux kernel stable tree nvmem: ensure sysfs writes handle write-protect pin 2020-05-15T14:20:02+00:00 Michael Auchter michael.auchter@ni.com 2020-05-11T14:50:41+00:00 b96fc5416b099a0c2509ca07a80b140d34db2b9b Commit 2a127da461a9 ("nvmem: add support for the write-protect pin") added support for handling write-protect pins to the nvmem core, and Commit 1c89074bf850 ("eeprom: at24: remove the write-protect pin support") retrofitted the at24 driver to use this support. These changes broke write() on the nvmem sysfs attribute for eeproms which utilize a write-protect pin, as the write callback invokes the nvmem device's reg_write callback directly which no longer handles changing the state of the write-protect pin. Change the read and write callbacks for the sysfs attribute to invoke nvmme_reg_read/nvmem_reg_write helpers which handle this, rather than calling reg_read/reg_write directly. Fixes: 2a127da461a9 ("nvmem: add support for the write-protect pin") Signed-off-by: Michael Auchter <michael.auchter@ni.com> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20200511145042.31223-3-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
Commit 2a127da461a9 ("nvmem: add support for the write-protect pin")
added support for handling write-protect pins to the nvmem core, and
Commit 1c89074bf850 ("eeprom: at24: remove the write-protect pin support")
retrofitted the at24 driver to use this support.

These changes broke write() on the nvmem sysfs attribute for eeproms
which utilize a write-protect pin, as the write callback invokes the
nvmem device's reg_write callback directly which no longer handles
changing the state of the write-protect pin.

Change the read and write callbacks for the sysfs attribute to invoke
nvmme_reg_read/nvmem_reg_write helpers which handle this, rather than
calling reg_read/reg_write directly.

Fixes: 2a127da461a9 ("nvmem: add support for the write-protect pin")
Signed-off-by: Michael Auchter <michael.auchter@ni.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20200511145042.31223-3-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
nvmem: core: cleanup old eeprom compat entry attributes 2020-04-28T13:02:48+00:00 Srinivas Kandagatla srinivas.kandagatla@linaro.org 2020-04-17T12:13:06+00:00 2a4542e55f1b592aa743fb319d4b2fd85f7e136e file permission are derived based on various configs for default nvmem sysfs file, reuse it to create the eeprom compat file too. Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20200417121306.23121-1-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
file permission are derived based on various configs for
default nvmem sysfs file, reuse it to create the eeprom
compat file too.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20200417121306.23121-1-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
nvmem: core: remove nvmem_sysfs_get_groups() 2020-03-25T18:23:49+00:00 Srinivas Kandagatla srinivas.kandagatla@linaro.org 2020-03-25T13:19:51+00:00 844003052719375bad24a740fed5d32c5a18efaf Now that we are using is_bin_visible callback, we do not need nvmem_sysfs_get_groups() anymore so move all the relevant data-structures and code to core.c Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20200325131951.31887-3-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
Now that we are using is_bin_visible callback, we do not need
nvmem_sysfs_get_groups() anymore so move all the relevant data-structures
and code to core.c

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20200325131951.31887-3-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
nvmem: core: use is_bin_visible for permissions 2020-03-25T18:23:48+00:00 Srinivas Kandagatla srinivas.kandagatla@linaro.org 2020-03-25T13:19:50+00:00 664f0549380cd5bee2cdac0a6ccfe21bdf74e027 By using is_bin_visible callback to set permissions will remove a large list of attribute groups. These group permissions can be dynamically derived in the callback. Also add checks for read/write callbacks and set permissions accordingly. Suggested-by: Greg KH <gregkh@linuxfoundation.org> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20200325131951.31887-2-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
By using is_bin_visible callback to set permissions will remove a
large list of attribute groups. These group permissions can be
dynamically derived in the callback.

Also add checks for read/write callbacks and set permissions accordingly.

Suggested-by: Greg KH <gregkh@linuxfoundation.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20200325131951.31887-2-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
nvmem: core: use device_register and device_unregister 2020-03-25T17:56:38+00:00 Srinivas Kandagatla srinivas.kandagatla@linaro.org 2020-03-24T17:15:58+00:00 f60442ddc40c21a99720ee990d5924c80a24728d use device_register/unregister instead of spliting them with no use. Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20200324171600.15606-2-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
use device_register/unregister instead of spliting them with no use.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20200324171600.15606-2-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
nvmem: core: add root_only member to nvmem device struct 2020-03-25T12:45:09+00:00 Srinivas Kandagatla srinivas.kandagatla@linaro.org 2020-03-25T12:21:15+00:00 e6de179d7a88b833ccadd18da5099d435acdac65 As we are planning to move to use sysfs is_bin_visible callback, having root_only as part of nvmem_device will help decide correct permissions. Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20200325122116.15096-2-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
As we are planning to move to use sysfs is_bin_visible callback,
having root_only as part of nvmem_device will help decide correct
permissions.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20200325122116.15096-2-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
nvmem: core: validate nvmem config before parsing 2020-03-19T06:41:03+00:00 Srinivas Kandagatla srinivas.kandagatla@linaro.org 2020-03-10T13:22:51+00:00 061a320b32d47438d64d64b412c0ea2c323a1470 nvmem provider has to provide either reg_read/write, add a check to enforce this. Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20200310132257.23358-9-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
nvmem provider has to provide either reg_read/write, add a check
to enforce this.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20200310132257.23358-9-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
nvmem: release the write-protect pin 2020-03-19T06:41:03+00:00 Khouloud Touil ktouil@baylibre.com 2020-03-10T13:22:50+00:00 a9c3766cb19cdadf2776aba41b64470002645894 Put the write-protect GPIO descriptor in nvmem_release() so that it can be automatically released when the associated device's reference count drops to 0. Fixes: 2a127da461a9 ("nvmem: add support for the write-protect pin") Reported-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Khouloud Touil <ktouil@baylibre.com> Cc: stable <stable@vger.kernel.org> [Bartosz: tweak the commit message] Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20200310132257.23358-8-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
Put the write-protect GPIO descriptor in nvmem_release() so that it can
be automatically released when the associated device's reference count
drops to 0.

Fixes: 2a127da461a9 ("nvmem: add support for the write-protect pin")
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Khouloud Touil <ktouil@baylibre.com>
Cc: stable <stable@vger.kernel.org>
[Bartosz: tweak the commit message]
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20200310132257.23358-8-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
nvmem: fix memory leak in error path 2020-03-19T06:41:02+00:00 Bartosz Golaszewski bgolaszewski@baylibre.com 2020-03-10T13:22:49+00:00 f7d8d7dcd978382dd1dd36e240dcddbfa6697796 We need to free the ida mapping and nvmem struct if the write-protect GPIO lookup fails. Fixes: 2a127da461a9 ("nvmem: add support for the write-protect pin") Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20200310132257.23358-7-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
We need to free the ida mapping and nvmem struct if the write-protect
GPIO lookup fails.

Fixes: 2a127da461a9 ("nvmem: add support for the write-protect pin")
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20200310132257.23358-7-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
nvmem: add a newline for readability 2020-03-19T06:41:02+00:00 Bartosz Golaszewski bgolaszewski@baylibre.com 2020-03-10T13:22:48+00:00 31c6ff51fdce7c507e1015bf5cefda8505a13809 Visibly separate the GPIO request from the previous operation in the code with a newline. Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20200310132257.23358-6-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
Visibly separate the GPIO request from the previous operation in the
code with a newline.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20200310132257.23358-6-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>