Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 4.9 61/80] mtd: cfi: fix deadloop in cfi_cmdset_0002.c do_write_buffer | Date | Fri, 1 May 2020 15:21:55 +0200 |
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From: Liu Jian <liujian56@huawei.com>
commit d9b8a67b3b95a5c5aae6422b8113adc1c2485f2b upstream.
In function do_write_buffer(), in the for loop, there is a case chip_ready() returns 1 while chip_good() returns 0, so it never break the loop. To fix this, chip_good() is enough and it should timeout if it stay bad for a while.
Fixes: dfeae1073583("mtd: cfi_cmdset_0002: Change write buffer to check correct value") Signed-off-by: Yi Huaijie <yihuaijie@huawei.com> Signed-off-by: Liu Jian <liujian56@huawei.com> Reviewed-by: Tokunori Ikegami <ikegami_to@yahoo.co.jp> Signed-off-by: Richard Weinberger <richard@nod.at> Cc: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/mtd/chips/cfi_cmdset_0002.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
--- a/drivers/mtd/chips/cfi_cmdset_0002.c +++ b/drivers/mtd/chips/cfi_cmdset_0002.c @@ -1879,7 +1879,11 @@ static int __xipram do_write_buffer(stru continue; } - if (time_after(jiffies, timeo) && !chip_ready(map, adr)) + /* + * We check "time_after" and "!chip_good" before checking "chip_good" to avoid + * the failure due to scheduling. + */ + if (time_after(jiffies, timeo) && !chip_good(map, adr, datum)) break; if (chip_good(map, adr, datum)) {
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