Subject: [merged] lib-genallocc-add-check-gen_pool_dma_alloc-if-dma-pointer-is-not-null.patch removed from -mm tree
To: prabhakar.csengg@xxxxxxxxx,b42378@xxxxxxxxxxxxx,joe@xxxxxxxxxxx,p.zabel@xxxxxxxxxxxxxx,sachin.kamat@xxxxxxxxxx,stable@xxxxxxxxxxxxxxx,mm-commits@xxxxxxxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Thu, 30 Jan 2014 12:04:57 -0800
The patch titled
Subject: lib/genalloc.c: add check gen_pool_dma_alloc() if dma pointer is not NULL
has been removed from the -mm tree. Its filename was
lib-genallocc-add-check-gen_pool_dma_alloc-if-dma-pointer-is-not-null.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: "Lad, Prabhakar" <prabhakar.csengg@xxxxxxxxx>
Subject: lib/genalloc.c: add check gen_pool_dma_alloc() if dma pointer is not NULL
In the gen_pool_dma_alloc() the dma pointer can be NULL and while
assigning gen_pool_virt_to_phys(pool, vaddr) to dma caused the following
crash on da850 evm,
Unable to handle kernel NULL pointer dereference at virtual address 00000000
pgd = c0004000
[00000000] *pgd=00000000
Internal error: Oops: 805 [#1] PREEMPT ARM
Modules linked in:
CPU: 0 PID: 1 Comm: swapper Tainted: G W 3.13.0-rc1-00001-g0609e45-dirty #5
task: c4830000 ti: c4832000 task.ti: c4832000
PC is at gen_pool_dma_alloc+0x30/0x3c
LR is at gen_pool_virt_to_phys+0x74/0x80
pc : [<c01a73b8>] lr : [<c01a6ff8>] psr: 60000013
sp : c4833e38 ip : 00000000 fp : 00000000
r10: c0428928 r9 : c0430e1c r8 : c0444b70
r7 : c04436f0 r6 : c5840000 r5 : 00000000 r4 : c4802fe0
r3 : 80000000 r2 : c4833e18 r1 : c4832018 r0 : 80000000
Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment kernel
Control: 0005317f Table: c0004000 DAC: 00000017
Process swapper (pid: 1, stack limit = 0xc48321c0)
Stack: (0xc4833e38 to 0xc4834000)
3e20: c0443700 c0461668
3e40: c0017df4 c0413f00 c0208b14 c0443700 c0444b5c c0485910 00000000 c0208b30
3e60: c0208b14 c0443700 00000001 c02072e0 c0443700 c0444b70 c0443734 00000000
3e80: 0000004f c0207500 c0444b70 c0207474 c4833e98 c0205cc4 c4822258 c48c9150
3ea0: 00000000 c0444b70 c4b2d780 c0459270 c4822200 c020644c c03a30d4 c019547c
3ec0: c0444b70 c0444b70 00000000 c040f01c c040c5c0 c0207a90 00000000 c0444b5c
3ee0: 00000001 c0208a90 c4832000 00000000 c040f01c c041298c c4832000 c040f038
3f00: 00000000 c0008848 c485ca80 c0468954 c4833f44 c4833f78 00000000 c0102b00
3f20: 00000000 c485ca20 00000000 c052c52c c03f1160 c00346c8 00000003 60000013
3f40: c039e7e8 00000000 00000007 00000007 c0445ca0 c0428924 c0428924 00000008
3f60: c04612e0 c040c5c0 0000004f c0428928 00000000 c040c4f8 00000007 00000007
3f80: c040c5c0 c003f3b0 00000000 c03021f8 00000000 00000000 00000000 00000000
3fa0: 00000000 c0302200 00000000 c0009710 00000000 00000000 00000000 00000000
3fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
3fe0: 00000000 00000000 00000000 00000000 00000013 00000000 00000001 00000000
[<c01a73b8>] (gen_pool_dma_alloc+0x30/0x3c) from [<c0413f00>] (davinci_pm_probe+0x40/0xa8)
[<c0413f00>] (davinci_pm_probe+0x40/0xa8) from [<c0208b30>] (platform_drv_probe+0x1c/0x4c)
[<c0208b30>] (platform_drv_probe+0x1c/0x4c) from [<c02072e0>] (driver_probe_device+0x98/0x22c)
[<c02072e0>] (driver_probe_device+0x98/0x22c) from [<c0207500>] (__driver_attach+0x8c/0x90)
[<c0207500>] (__driver_attach+0x8c/0x90) from [<c0205cc4>] (bus_for_each_dev+0x6c/0x8c)
[<c0205cc4>] (bus_for_each_dev+0x6c/0x8c) from [<c020644c>] (bus_add_driver+0x124/0x1d4)
[<c020644c>] (bus_add_driver+0x124/0x1d4) from [<c0207a90>] (driver_register+0x78/0xf8)
[<c0207a90>] (driver_register+0x78/0xf8) from [<c0208a90>] (platform_driver_probe+0x20/0xa4)
[<c0208a90>] (platform_driver_probe+0x20/0xa4) from [<c041298c>] (davinci_init_late+0xc/0x14)
[<c041298c>] (davinci_init_late+0xc/0x14) from [<c040f038>] (init_machine_late+0x1c/0x28)
[<c040f038>] (init_machine_late+0x1c/0x28) from [<c0008848>] (do_one_initcall+0x34/0x15c)
[<c0008848>] (do_one_initcall+0x34/0x15c) from [<c040c4f8>] (kernel_init_freeable+0xe4/0x1ac)
[<c040c4f8>] (kernel_init_freeable+0xe4/0x1ac) from [<c0302200>] (kernel_init+0x8/0xec)
[<c0302200>] (kernel_init+0x8/0xec) from [<c0009710>] (ret_from_fork+0x14/0x24)
Code: 0afffffa e1a00004 e1a01006 ebfffef2 (e5850000)
---[ end trace 24fd42a15d1cdd7d ]---
This patch fixes the above.
[akpm@xxxxxxxxxxxxxxxxxxxx: update kerneldoc]
Signed-off-by: Lad, Prabhakar <prabhakar.csengg@xxxxxxxxx>
Cc: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
Cc: Nicolin Chen <b42378@xxxxxxxxxxxxx>
Cc: Joe Perches <joe@xxxxxxxxxxx>
Cc: Sachin Kamat <sachin.kamat@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> [3.13.x]
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/genalloc.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff -puN lib/genalloc.c~lib-genallocc-add-check-gen_pool_dma_alloc-if-dma-pointer-is-not-null lib/genalloc.c
--- a/lib/genalloc.c~lib-genallocc-add-check-gen_pool_dma_alloc-if-dma-pointer-is-not-null
+++ a/lib/genalloc.c
@@ -316,7 +316,7 @@ EXPORT_SYMBOL(gen_pool_alloc);
* gen_pool_dma_alloc - allocate special memory from the pool for DMA usage
* @pool: pool to allocate from
* @size: number of bytes to allocate from the pool
- * @dma: dma-view physical address
+ * @dma: dma-view physical address return value. Use NULL if unneeded.
*
* Allocate the requested number of bytes from the specified pool.
* Uses the pool allocation function (with first-fit algorithm by default).
@@ -334,7 +334,8 @@ void *gen_pool_dma_alloc(struct gen_pool
if (!vaddr)
return NULL;
- *dma = gen_pool_virt_to_phys(pool, vaddr);
+ if (dma)
+ *dma = gen_pool_virt_to_phys(pool, vaddr);
return (void *)vaddr;
}
_
Patches currently in -mm which might be from prabhakar.csengg@xxxxxxxxx are
origin.patch
linux-next.patch
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