linux-stable.git/drivers/misc, branch linux-3.2.y

eeprom: at24: check at24_read/write arguments

2018-03-03T15:50:41+00:00

commit d9bcd462daf34aebb8de9ad7f76de0198bb5a0f0 upstream.

So far we completely rely on the caller to provide valid arguments.
To be on the safe side perform an own sanity check.

Signed-off-by: Heiner Kallweit 
Signed-off-by: Bartosz Golaszewski 
Signed-off-by: Ben Hutchings

vmw_balloon: fix for a -Wuninitialized warning

2017-11-11T13:34:46+00:00

commit 3e5ba466d515eb3fb1e0e975a3d8e499126ae2b5 upstream.

Fix for a -Wuninitialized compiler warning. Changed return value of
vmballoon_send_lock_page() from bool to int to be able to distinguish
between the error cases to avoid uninitialized use of hv_status in
vmballoon_reserve_page()

Signed-off-by: Danny Kukawka 
Signed-off-by: Greg Kroah-Hartman 
Signed-off-by: Ben Hutchings

scsi: ses: do not add a device to an enclosure if enclosure_add_links() fails.

2017-10-12T14:27:13+00:00

commit 62e62ffd95539b9220894a7900a619e0f3ef4756 upstream.

The enclosure_add_device() function should fail if it can't create the
relevant sysfs links.

Signed-off-by: Maurizio Lombardi 
Tested-by: Douglas Miller 
Acked-by: James Bottomley 
Signed-off-by: Martin K. Petersen 
Signed-off-by: Ben Hutchings

drivers/misc/ad525x_dpot: AD5274 fix RDAC read back errors

2016-04-30T22:05:16+00:00

commit f3df53e4d70b5736368a8fe8aa1bb70c1cb1f577 upstream.

Fix RDAC read back errors caused by a typo. Value must shift by 2.

Fixes: a4bd394956f2 ("drivers/misc/ad525x_dpot.c: new features")
Signed-off-by: Michael Hennerich 
Signed-off-by: Greg Kroah-Hartman 
Signed-off-by: Ben Hutchings

enclosure: fix WARN_ON in dual path device removing

2014-01-03T04:33:27+00:00

commit a1470c7bf3a4676e62e4c0fb204e339399eb5c59 upstream.

Bug report from: wenxiong@linux.vnet.ibm.com

The issue is happened in dual controller configuration. We got the
sysfs warnings when rmmod the ipr module.

enclosure_unregister() in drivers/msic/enclosure.c, call device_unregister()
for each componment deivce, device_unregister() ->device_del()->kobject_del()
->sysfs_remove_dir(). In sysfs_remove_dir(), set kobj->sd = NULL.

For each componment device,
enclosure_component_release()->enclosure_remove_links()->sysfs_remove_link()
in which checking kobj->sd again, it has been set as NULL when doing
device_unregister. So we saw all these sysfs WARNING.

Tested-by: wenxiong@linux.vnet.ibm.com
Signed-off-by: James Bottomley 
Signed-off-by: Ben Hutchings

MISC: hpilo, remove pci_disable_device

2013-01-03T03:33:53+00:00

commit bcdee04ea7ae0406ae69094f6df1aacb66a69a0b upstream.

pci_disable_device(pdev) used to be in pci remove function. But this
PCI device has two functions with interrupt lines connected to a
single pin. The other one is a USB host controller. So when we disable
the PIN there e.g. by rmmod hpilo, the controller stops working. It is
because the interrupt link is disabled in ACPI since it is not
refcounted yet. See acpi_pci_link_free_irq called from
acpi_pci_irq_disable.

It is not the best solution whatsoever, but as a workaround until the
ACPI irq link refcounting is sorted out this should fix the reported
errors.

References: https://lkml.org/lkml/2008/11/4/535

Signed-off-by: Jiri Slaby 
Cc: Grant Grundler 
Cc: Nobin Mathew 
Cc: Robert Hancock 
Cc: Arnd Bergmann 
Cc: David Altobelli 
Signed-off-by: Greg Kroah-Hartman 
Signed-off-by: Ben Hutchings

SGI-XP: handle non-fatal traps

2013-01-03T03:33:46+00:00

commit 891348ca0f66206f1dc0e30d63757e3df1ae2d15 upstream.

We found a user code which was raising a divide-by-zero trap.  That trap
would lead to XPC connections between system-partitions being torn down
due to the die_chain notifier callouts it received.

This also revealed a different issue where multiple callers into
xpc_die_deactivate() would all attempt to do the disconnect in parallel
which would sometimes lock up but often overwhelm the console on very
large machines as each would print at least one line of output at the
end of the deactivate.

I reviewed all the users of the die_chain notifier and changed the code
to ignore the notifier callouts for reasons which will not actually lead
to a system to continue on to call die().

[akpm@linux-foundation.org: fix ia64]
Signed-off-by: Robin Holt 
Cc: Thomas Gleixner 
Cc: Ingo Molnar 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds 
Signed-off-by: Ben Hutchings

drivers/misc/sgi-xp/xpc_uv.c: SGI XPC fails to load when cpu 0 is out of IRQ resources

2012-09-12T02:37:25+00:00

commit 7838f994b4fceff24c343f4e26a6cf4393869579 upstream.

On many of our larger systems, CPU 0 has had all of its IRQ resources
consumed before XPC loads.  Worst cases on machines with multiple 10
GigE cards and multiple IB cards have depleted the entire first socket
of IRQs.

This patch makes selecting the node upon which IRQs are allocated (as
well as all the other GRU Message Queue structures) specifiable as a
module load param and has a default behavior of searching all nodes/cpus
for an available resources.

[akpm@linux-foundation.org: fix build: include cpu.h and module.h]
Signed-off-by: Robin Holt 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds 
Signed-off-by: Ben Hutchings

x86,kgdb: Fix DEBUG_RODATA limitation using text_poke()

2012-04-13T15:33:48+00:00

commit 3751d3e85cf693e10e2c47c03c8caa65e171099b upstream.

There has long been a limitation using software breakpoints with a
kernel compiled with CONFIG_DEBUG_RODATA going back to 2.6.26. For
this particular patch, it will apply cleanly and has been tested all
the way back to 2.6.36.

The kprobes code uses the text_poke() function which accommodates
writing a breakpoint into a read-only page.  The x86 kgdb code can
solve the problem similarly by overriding the default breakpoint
set/remove routines and using text_poke() directly.

The x86 kgdb code will first attempt to use the traditional
probe_kernel_write(), and next try using a the text_poke() function.
The break point install method is tracked such that the correct break
point removal routine will get called later on.

Cc: x86@kernel.org
Cc: Thomas Gleixner 
Cc: Ingo Molnar 
Cc: H. Peter Anvin 
Inspried-by: Masami Hiramatsu 
Signed-off-by: Jason Wessel 
Signed-off-by: Greg Kroah-Hartman

kgdbts: (2 of 2) fix single step awareness to work correctly with SMP

2012-04-13T15:33:48+00:00

commit 23bbd8e346f1ef3fc1219c79cea53d8d52b207d8 upstream.

The do_fork and sys_open tests have never worked properly on anything
other than a UP configuration with the kgdb test suite.  This is
because the test suite did not fully implement the behavior of a real
debugger.  A real debugger tracks the state of what thread it asked to
single step and can correctly continue other threads of execution or
conditionally stop while waiting for the original thread single step
request to return.

Below is a simple method to cause a fatal kernel oops with the kgdb
test suite on a 2 processor ARM system:

while [ 1 ] ; do ls > /dev/null 2> /dev/null; done&
while [ 1 ] ; do ls > /dev/null 2> /dev/null; done&
echo V1I1F100 > /sys/module/kgdbts/parameters/kgdbts

Very soon after starting the test the kernel will start warning with
messages like:

kgdbts: BP mismatch c002487c expected c0024878
------------[ cut here ]------------
WARNING: at drivers/misc/kgdbts.c:317 check_and_rewind_pc+0x9c/0xc4()
[] (check_and_rewind_pc+0x9c/0xc4)
[] (validate_simple_test+0x3c/0xc4)
[] (run_simple_test+0x1e8/0x274)

The kernel will eventually recovers, but the test suite has completely
failed to test anything useful.

This patch implements behavior similar to a real debugger that does
not rely on hardware single stepping by using only software planted
breakpoints.

In order to mimic a real debugger, the kgdb test suite now tracks the
most recent thread that was continued (cont_thread_id), with the
intent to single step just this thread.  When the response to the
single step request stops in a different thread that hit the original
break point that thread will now get continued, while the debugger
waits for the thread with the single step pending.  Here is a high
level description of the sequence of events.

   cont_instead_of_sstep = 0;

1) set breakpoint at do_fork
2) continue
3)   Save the thread id where we stop to cont_thread_id
4) Remove breakpoint at do_fork
5) Reset the PC if needed depending on kernel exception type
6) soft single step
7)   Check where we stopped
       if current thread != cont_thread_id {
           if (here for more than 2 times for the same thead) {
              ### must be a really busy system, start test again ###
	      goto step 1
           }
           goto step 5
       } else {
           cont_instead_of_sstep = 0;
       }
8) clean up and run test again if needed
9) Clear out any threads that were waiting on a break point at the
   point in time the test is ended with get_cont_catch().  This
   happens sometimes because breakpoints are used in place of single
   stepping and some threads could have been in the debugger exception
   handling queue because breakpoints were hit concurrently on
   different CPUs.  This also means we wait at least one second before
   unplumbing the debugger connection at the very end, so as respond
   to any debug threads waiting to be serviced.

Signed-off-by: Jason Wessel 
Signed-off-by: Greg Kroah-Hartman