linux-toradex.git/drivers/char, branch v2.6.27.7

Fix platform drivers that crash on suspend/resume

2008-11-20T22:54:44+00:00

commit fe2d5ffc74a1de6a31e9fd65b65cce72d881edf7 upstream.

It turns out that if one registers a struct platform_device, the
platform device code expects that platform_device.device->driver points
to a struct driver inside a struct platform_driver.

This is not the case with the ipmi-si, ipmi-msghandler and ibmaem
drivers, which causes the suspend/resume hook functions to jump off into
nowhere, causing a crash.  Make this assumption hold true for these
three drivers.

Signed-off-by: Darrick J. Wong 
Acked-by: Corey Minyard 
Cc: Jean Delvare 
Cc: Kay Sievers 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

ipmi: add MODULE_ALIAS to load ipmi_devintf with ipmi_si

2008-11-07T03:05:37+00:00

commit 6c89161b10f5771ee0b51ada0fce0e8835e72ade upstream

The ipmi_devintf module contains the userspace interface for IPMI devices,
yet will not be loaded automatically with a system interface handler
driver.

Add a MODULE_ALIAS for the "platform:ipmi_si" MODALIAS exported by the
ipmi_si driver, so that userspace knows of the recommendation.

Signed-off-by: Scott James Remnant 
Cc: Tim Gardner 
Cc: Corey Minyard 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

agp: Fix stolen memory counting on G4X.

2008-11-07T03:05:36+00:00

commit 82e14a6215cbc9804ecc35281e973c6c8ce22fe7 upstream

On the GM45, the amount of stolen memory mapped to the GTT was underestimated,
even though we had 508KB more available since the GTT doesn't take from
stolen memory. On the non-GM45 G4X, we overestimated how much stolen was
mapped to the GTT by 4KB, resulting in GPU page faults when that page was
accessed.

This update requires a corresponding update to xf86-video-intel to work
correctly.

Signed-off-by: Eric Anholt 
Signed-off-by: Dave Airlie 
Signed-off-by: Greg Kroah-Hartman

hvc_console: Fix free_irq in spinlocked section

2008-10-25T21:32:41+00:00

commit eef2622a9fcfa964073333ea72c7c9cd20ad45e6 upstream

hvc_console: Fix free_irq in spinlocked section

    commit 611e097d7707741a336a0677d9d69bec40f29f3d
    Author: Christian Borntraeger 
    hvc_console: rework setup to replace irq functions with callbacks
    introduced a spinlock recursion problem. The notifier_del is
    called with a lock held, and in turns calls free_irq which then
    complains when manipulating procfs. This fixes it by moving the
    call to the notifier to outside of the locked section.

Signed-off-by: Christian Borntraeger
Signed-off-by: Benjamin Herrenschmidt 
Signed-off-by: Greg Kroah-Hartman

tty: Termios locking - sort out real_tty confusions and lock reads

2008-10-18T17:49:11+00:00

commit 8f520021837d45c47d0ab57e7271f8d88bf7f3a4 upstream

(only the tty_io.c portion of this commit)

This moves us towards sanity and should mean our termios locking is now
complete and comprehensive.

Signed-off-by: Alan Cox 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

kgdboc,tty: Fix tty polling search to use name correctly

2008-09-26T15:36:42+00:00

The tty_find_polling_driver() routine did not correctly check the base
part of the tty name.  This can lead to kgdboc selecting an incorrect
driver, as well as accepting a completely invalid tty such as "echo
ffff0 > /sys/module/kgdboc/parameters/kgdboc".

Signed-off-by: Jason Wessel

drivers/char/random.c: fix a race which can lead to a bogus BUG()

2008-09-03T02:21:40+00:00

Fix a bug reported by and diagnosed by Aaron Straus.

This is a regression intruduced into 2.6.26 by

    commit adc782dae6c4c0f6fb679a48a544cfbcd79ae3dc
    Author: Matt Mackall 
    Date:   Tue Apr 29 01:03:07 2008 -0700

        random: simplify and rename credit_entropy_store

credit_entropy_bits() does:

	spin_lock_irqsave(&r->lock, flags);
	...
	if (r->entropy_count > r->poolinfo->POOLBITS)
		r->entropy_count = r->poolinfo->POOLBITS;

so there is a time window in which this BUG_ON():

static size_t account(struct entropy_store *r, size_t nbytes, int min,
		      int reserved)
{
	unsigned long flags;

	BUG_ON(r->entropy_count > r->poolinfo->POOLBITS);

	/* Hold lock while accounting */
	spin_lock_irqsave(&r->lock, flags);

can trigger.

We could fix this by moving the assertion inside the lock, but it seems
safer and saner to revert to the old behaviour wherein
entropy_store.entropy_count at no time exceeds
entropy_store.poolinfo->POOLBITS.

Reported-by: Aaron Straus 
Cc: Matt Mackall 
Cc: Theodore Ts'o 
Cc: 		[2.6.26.x]
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

tty: Fix termios tty window resize race with pty/tty pair

2008-08-27T21:37:09+00:00

Kanru Chen posted a patch versus the old code which deals with the case
where you resize the pty side of a pty/tty pair. In that situation the
termios data is updated for both pty and tty but the locks are not held
for the right side.

This implements the fix differently against the updated tty code. Patch
by self but the hard bit (noticing and fixing the bug) is thanks to Kanru
Chen.

Signed-off-by: Alan Cox 
Signed-off-by: Linus Torvalds

tty: TIOCGSOFTCAR/SSOFTCAR on pty is wron

2008-08-27T21:37:09+00:00

The termios settings ioctls on a pty should affect the bound tty side not
the pty. The SOFTCAR ioctls use the wrong device file.

Signed-off-by: Alan Cox 
Signed-off-by: Linus Torvalds

removed unused #include 's

2008-08-23T19:14:12+00:00

This patch lets the files using linux/version.h match the files that
#include it.

Signed-off-by: Adrian Bunk 
Signed-off-by: Linus Torvalds