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| author | Cyril Bur <cyrilbur@gmail.com> | 2017-11-03 05:41:40 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-11-06 12:20:26 +0300 |
| commit | efe6941450b80927d3a5721594b7f103cb0c7428 (patch) | |
| tree | 72dfff942caf4043a5d34dd37b4464dc088d45d0 | |
| parent | e32ec15a2d57977f9f69b222b7b0395a2d60a71c (diff) | |
| download | linux-efe6941450b80927d3a5721594b7f103cb0c7428.tar.xz | |
mtd: powernv_flash: Don't return -ERESTARTSYS on interrupted token acquisition
Because the MTD core might split up a read() or write() from userspace
into several calls to the driver, we may fail to get a token but already
have done some work, best to return -EINTR back to userspace and have
them decide what to do.
Signed-off-by: Cyril Bur <cyrilbur@gmail.com>
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
| -rw-r--r-- | drivers/mtd/devices/powernv_flash.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/mtd/devices/powernv_flash.c b/drivers/mtd/devices/powernv_flash.c index 4dd3b5d2feb2..3343d4f5c4f3 100644 --- a/drivers/mtd/devices/powernv_flash.c +++ b/drivers/mtd/devices/powernv_flash.c @@ -47,6 +47,11 @@ enum flash_op { FLASH_OP_ERASE, }; +/* + * Don't return -ERESTARTSYS if we can't get a token, the MTD core + * might have split up the call from userspace and called into the + * driver more than once, we'll already have done some amount of work. + */ static int powernv_flash_async_op(struct mtd_info *mtd, enum flash_op op, loff_t offset, size_t len, size_t *retlen, u_char *buf) { @@ -63,6 +68,8 @@ static int powernv_flash_async_op(struct mtd_info *mtd, enum flash_op op, if (token < 0) { if (token != -ERESTARTSYS) dev_err(dev, "Failed to get an async token\n"); + else + token = -EINTR; return token; } |