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| author | Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> | 2014-09-18 23:33:49 +0400 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2014-09-19 20:43:09 +0200 |
| commit | bb98d9d1d2e791f368295c9c09c9a03fe3ac0e62 (patch) | |
| tree | cba9ae3ea8c136a404e2dce04b31f9a5f09bcc41 /drivers/mmc | |
| parent | b9bd7ff8069a7125da897de657da421c497d4f15 (diff) | |
| download | linux-bb98d9d1d2e791f368295c9c09c9a03fe3ac0e62.tar.gz | |
mmc: tmio: prevent endless loop in tmio_mmc_set_clock()
I spent a couple of days with the driver just hanging due to me forgetting to specify the external crystal frequency, so that clk_get_rate() returned 0 and thus the loop in tmio_mmc_set_clock() never ended. I don't think that's an acceptable behavior, so I suggest that the minimum frequency is checked for 0 in tmio_mmc_host_probe(). Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> Acked-by: Ian Molton <ian.molton@codethink.co.uk> Cc: stable@vger.kernel.org Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/host/tmio_mmc_pio.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/mmc/host/tmio_mmc_pio.c b/drivers/mmc/host/tmio_mmc_pio.c index 692e578cf4d7..e487ba4bb01a 100644 --- a/drivers/mmc/host/tmio_mmc_pio.c +++ b/drivers/mmc/host/tmio_mmc_pio.c @@ -1122,6 +1122,15 @@ int tmio_mmc_host_probe(struct tmio_mmc_host **host, } /* + * Check the sanity of mmc->f_min to prevent tmio_mmc_set_clock() from + * looping forever... + */ + if (mmc->f_min == 0) { + ret = -EINVAL; + goto host_free; + } + + /* * While using internal tmio hardware logic for card detection, we need * to ensure it stays powered for it to work. */ |