A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-28 10:41:38 -04:00
Code Issues Projects Releases Packages Wiki Activity

iscsi-target: Fix connection reset hang with percpu_ida_alloc

Browse source 
This patch addresses a bug where connection reset would hang
indefinately once percpu_ida_alloc() was starved for tags, due
to the fact that it always assumed uninterruptible sleep mode.

So now make percpu_ida_alloc() check for signal_pending_state() for
making interruptible sleep optional, and convert iscsit_allocate_cmd()
to set TASK_INTERRUPTIBLE for GFP_KERNEL, or TASK_RUNNING for
GFP_ATOMIC.

Reported-by: Linus Torvalds <[email protected]>
Cc: Kent Overstreet <[email protected]>
Cc: <[email protected]> #3.12+
Signed-off-by: Nicholas Bellinger <[email protected]>
This commit is contained in:
Nicholas Bellinger 2014-01-20 03:36:24 +00:00
commit 555b270e25
2 changed files with 8 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

9
lib/percpu_ida.c
View file

@ -138,14 +138,14 @@ static inline unsigned alloc_local_tag(struct percpu_ida_cpu *tags)
* tag_pool_init()), or otherwise -ENOSPC on allocation failure.
*
* Safe to be called from interrupt context (assuming it isn't passed
* TASK_UNINTERRUPTIBLE, of course).
* TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE, of course).
*
* @gfp indicates whether or not to wait until a free id is available (it's not
* used for internal memory allocations); thus if passed __GFP_WAIT we may sleep
* however long it takes until another thread frees an id (same semantics as a
* mempool).
*
* Will not fail if passed TASK_UNINTERRUPTIBLE.
* Will not fail if passed TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE.
*/
int percpu_ida_alloc(struct percpu_ida *pool, int state)
{
@ -195,6 +195,11 @@ int percpu_ida_alloc(struct percpu_ida *pool, int state)
if (tag >= 0 || state == TASK_RUNNING)
break;
if (signal_pending_state(state, current)) {
tag = -ERESTARTSYS;
break;
}
schedule();
local_irq_save(flags);