AcoSail/kernel_optimize_test
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[SCSI] compat: don't perform unneeded copy in sg_io code

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The members from 'status' in struct sg_io_hdr to the last are used to
transfer information from kernel to user space.  The values that user
space sets are just ignored.

Signed-off-by: Alexey Zaytsev <alexey.zaytsev@gmail.com>
Acked-by: Jens Axboe <jens.axboe@oracle.com>
Acked-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Alexey Zaytsev 2009-06-10 12:56:56 -07:00 committed by James Bottomley
parent dc577d554a
commit df59c0ad05
1 changed files with 0 additions and 6 deletions
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6
fs/compat_ioctl.c
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@ -788,12 +788,6 @@ static int sg_ioctl_trans(unsigned int fd, unsigned int cmd, unsigned long arg)
if (put_user(compat_ptr(data), &sgio->usr_ptr))
return -EFAULT;
if (copy_in_user(&sgio->status, &sgio32->status,
(4 * sizeof(unsigned char)) +
(2 * sizeof(unsigned short)) +
(3 * sizeof(int))))
return -EFAULT;
err = sys_ioctl(fd, cmd, (unsigned long) sgio);
if (err >= 0) {