[PATCH v4 04/10] mtd: powernv_flash: Don't return -ERESTARTSYS on interrupted token acquisition
From: Cyril Bur <hidden>
Date: 2017-10-10 03:33:30
Subsystem:
memory technology devices (mtd), the rest · Maintainers:
Miquel Raynal, Richard Weinberger, Vignesh Raghavendra, Linus Torvalds
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 <redacted> --- drivers/mtd/devices/powernv_flash.c | 7 +++++++ 1 file changed, 7 insertions(+)
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; }
--
2.14.2