diff options
| author | Felipe Contreras <felipe.contreras@nokia.com> | 2011-03-11 18:29:06 -0600 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-03-14 12:22:27 -0700 |
| commit | ab42abf33a3efdf754710a0a513c00c40854cd61 (patch) | |
| tree | a8c7a9aa9b6cab93b767caed5bfaf4b318711e8b /drivers/staging/tidspbridge/rmgr | |
| parent | 17e2a542032f3ab735352d1d4b5d2ca3c154158a (diff) | |
staging: tidspbridge: protect dmm_map properly
We need to protect not only the dmm_map list, but the individual
map_obj's, otherwise, we might be building the scatter-gather list with
garbage. So, use the existing proc_lock for that.
I observed race conditions which caused kernel panics while running
stress tests, also, Tuomas Kulve found it happening quite often in
Gumstix Over. This patch fixes those.
Cc: Tuomas Kulve <tuomas@kulve.fi>
Signed-off-by: Felipe Contreras <felipe.contreras@nokia.com>
Signed-off-by: Omar Ramirez Luna <omar.ramirez@ti.com>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/staging/tidspbridge/rmgr')
| -rw-r--r-- | drivers/staging/tidspbridge/rmgr/proc.c | 19 |
1 files changed, 14 insertions, 5 deletions
diff --git a/drivers/staging/tidspbridge/rmgr/proc.c b/drivers/staging/tidspbridge/rmgr/proc.c index 54f61336d778..c4e5c4e0d71c 100644 --- a/drivers/staging/tidspbridge/rmgr/proc.c +++ b/drivers/staging/tidspbridge/rmgr/proc.c @@ -779,12 +779,14 @@ int proc_begin_dma(void *hprocessor, void *pmpu_addr, u32 ul_size, (u32)pmpu_addr, ul_size, dir); + mutex_lock(&proc_lock); + /* find requested memory are in cached mapping information */ map_obj = find_containing_mapping(pr_ctxt, (u32) pmpu_addr, ul_size); if (!map_obj) { pr_err("%s: find_containing_mapping failed\n", __func__); status = -EFAULT; - goto err_out; + goto no_map; } if (memory_give_ownership(map_obj, (u32) pmpu_addr, ul_size, dir)) { @@ -793,6 +795,8 @@ int proc_begin_dma(void *hprocessor, void *pmpu_addr, u32 ul_size, status = -EFAULT; } +no_map: + mutex_unlock(&proc_lock); err_out: return status; @@ -817,21 +821,24 @@ int proc_end_dma(void *hprocessor, void *pmpu_addr, u32 ul_size, (u32)pmpu_addr, ul_size, dir); + mutex_lock(&proc_lock); + /* find requested memory are in cached mapping information */ map_obj = find_containing_mapping(pr_ctxt, (u32) pmpu_addr, ul_size); if (!map_obj) { pr_err("%s: find_containing_mapping failed\n", __func__); status = -EFAULT; - goto err_out; + goto no_map; } if (memory_regain_ownership(map_obj, (u32) pmpu_addr, ul_size, dir)) { pr_err("%s: InValid address parameters %p %x\n", __func__, pmpu_addr, ul_size); status = -EFAULT; - goto err_out; } +no_map: + mutex_unlock(&proc_lock); err_out: return status; } @@ -1724,9 +1731,8 @@ int proc_un_map(void *hprocessor, void *map_addr, (p_proc_object->bridge_context, va_align, size_align); } - mutex_unlock(&proc_lock); if (status) - goto func_end; + goto unmap_failed; /* * A successful unmap should be followed by removal of map_obj @@ -1735,6 +1741,9 @@ int proc_un_map(void *hprocessor, void *map_addr, */ remove_mapping_information(pr_ctxt, (u32) map_addr, size_align); +unmap_failed: + mutex_unlock(&proc_lock); + func_end: dev_dbg(bridge, "%s: hprocessor: 0x%p map_addr: 0x%p status: 0x%x\n", __func__, hprocessor, map_addr, status); |