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cris: switch to get_user_pages_fast() 

no point holding ->mmap_sem over both calls.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2017-11-18 14:37:46 -05:00
parent c803c9c6c9
commit 9a949e8ff9
1 changed files with 7 additions and 16 deletions
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23
arch/cris/arch-v32/drivers/cryptocop.c
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@ -2717,37 +2717,28 @@ static int cryptocop_ioctl_process(struct inode *inode, struct file *filp, unsig
}
}
/* Acquire the mm page semaphore. */
down_read(&current->mm->mmap_sem);
err = get_user_pages((unsigned long int)(oper.indata + prev_ix),
err = get_user_pages_fast((unsigned long)(oper.indata + prev_ix),
noinpages,
0, /* read access only for in data */
inpages,
NULL);
false, /* read access only for in data */
inpages);
if (err < 0) {
up_read(&current->mm->mmap_sem);
nooutpages = noinpages = 0;
DEBUG_API(printk("cryptocop_ioctl_process: get_user_pages indata\n"));
goto error_cleanup;
}
noinpages = err;
if (oper.do_cipher){
err = get_user_pages((unsigned long int)oper.cipher_outdata,
if (oper.do_cipher) {
err = get_user_pages_fast((unsigned long)oper.cipher_outdata,
nooutpages,
FOLL_WRITE, /* write access for out data */
outpages,
NULL);
up_read(&current->mm->mmap_sem);
true, /* write access for out data */
outpages);
if (err < 0) {
nooutpages = 0;
DEBUG_API(printk("cryptocop_ioctl_process: get_user_pages outdata\n"));
goto error_cleanup;
}
nooutpages = err;
} else {
up_read(&current->mm->mmap_sem);
}
/* Add 6 to nooutpages to make room for possibly inserted buffers for storing digest and