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| author |   Bernd Schmidt <bernd.schmidt@analog.com> | 2007-10-10 17:54:19 +0800 |
|---|---|---|
| committer |   Bryan Wu <bryan.wu@analog.com> | 2007-10-10 17:54:19 +0800 |
| commit | bc41bb11654f7fbb8cae2d316a7c2ac5ebf759d2 (patch) | |
| tree | 00ed385f85322c42e9fcca6511de7f79716b7785 /arch/blackfin/kernel | |
| parent | Blackfin arch: Export strcpy - occasionally get module link failures otherwise (diff) | |
| download | linux-dev-bc41bb11654f7fbb8cae2d316a7c2ac5ebf759d2.tar.xz linux-dev-bc41bb11654f7fbb8cae2d316a7c2ac5ebf759d2.zip | |
Blackfin arch: fix bug libstdc++ calling writev with an iovec containing { NULL, 0 } fails on Blackfin
Fix a problem reported in the forums - libstdc++ can call writev with an
iovec containing { NULL, 0 }, which works fine on i686-linux, but fails on
Blackfin. Fixed by allowing size 0 transfers to/from userspace regardless
of the address.
Signed-off-by: Bernd Schmidt <bernd.schmidt@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
Diffstat (limited to 'arch/blackfin/kernel')
| -rw-r--r-- | arch/blackfin/kernel/process.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/blackfin/kernel/process.c b/arch/blackfin/kernel/process.c index de7d048bd4ee..9124467651c4 100644 --- a/arch/blackfin/kernel/process.c +++ b/arch/blackfin/kernel/process.c @@ -395,7 +395,8 @@ void finish_atomic_sections (struct pt_regs *regs) #if defined(CONFIG_ACCESS_CHECK) int _access_ok(unsigned long addr, unsigned long size) { - + if (size == 0) + return 1; if (addr > (addr + size)) return 0; if (segment_eq(get_fs(), KERNEL_DS)) |