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| author | Per Forlin <per.forlin@linaro.org> | 2011-08-19 14:52:37 +0200 |
|---|---|---|
| committer | Chris Ball <cjb@laptop.org> | 2011-10-26 15:43:34 -0400 |
| commit | 1b676f70c108cda90cf9d114d16c677584400efc (patch) | |
| tree | 7f4a18ade6db764ba3c882e294040a91adc2911e /drivers/mmc/core/debugfs.c | |
| parent | df87ecbf19109bab04a92df047a9949838206abc (diff) | |
| download | linux-1b676f70c108cda90cf9d114d16c677584400efc.tar.gz | |
mmc: core: add random fault injection
This adds support to inject data errors after a completed host transfer. The mmc core will return error even though the host transfer is successful. This simple fault injection proved to be very useful to test the non-blocking error handling in the mmc_blk_issue_rw_rq(). Random faults can also test how the host driver handles pre_req() and post_req() in case of errors. Signed-off-by: Per Forlin <per.forlin@linaro.org> Acked-by: Akinobu Mita <akinobu.mita@gmail.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers/mmc/core/debugfs.c')
| -rw-r--r-- | drivers/mmc/core/debugfs.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/mmc/core/debugfs.c b/drivers/mmc/core/debugfs.c index 998797ed67a6..5acd707699c9 100644 --- a/drivers/mmc/core/debugfs.c +++ b/drivers/mmc/core/debugfs.c @@ -12,6 +12,7 @@ #include <linux/seq_file.h> #include <linux/slab.h> #include <linux/stat.h> +#include <linux/fault-inject.h> #include <linux/mmc/card.h> #include <linux/mmc/host.h> @@ -158,6 +159,23 @@ static int mmc_clock_opt_set(void *data, u64 val) return 0; } +#ifdef CONFIG_FAIL_MMC_REQUEST + +static DECLARE_FAULT_ATTR(fail_mmc_request); + +#ifdef KERNEL +/* + * Internal function. Pass the boot param fail_mmc_request to + * the setup fault injection attributes routine. + */ +static int __init setup_fail_mmc_request(char *str) +{ + return setup_fault_attr(&fail_mmc_request, str); +} +__setup("fail_mmc_request=", setup_fail_mmc_request); +#endif /* KERNEL */ +#endif /* CONFIG_FAIL_MMC_REQUEST */ + DEFINE_SIMPLE_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set, "%llu\n"); @@ -188,6 +206,13 @@ void mmc_add_host_debugfs(struct mmc_host *host) root, &host->clk_delay)) goto err_node; #endif +#ifdef CONFIG_FAIL_MMC_REQUEST + host->fail_mmc_request = fail_mmc_request; + if (IS_ERR(fault_create_debugfs_attr("fail_mmc_request", + root, + &host->fail_mmc_request))) + goto err_node; +#endif return; err_node: |