summaryrefslogtreecommitdiff
path: root/drivers/mmc/core/debugfs.c
diff options
context:
space:
mode:
authorPer Forlin <per.forlin@linaro.org>2011-08-19 16:52:37 +0400
committerChris Ball <cjb@laptop.org>2011-10-26 23:43:34 +0400
commit1b676f70c108cda90cf9d114d16c677584400efc (patch)
tree7f4a18ade6db764ba3c882e294040a91adc2911e /drivers/mmc/core/debugfs.c
parentdf87ecbf19109bab04a92df047a9949838206abc (diff)
downloadlinux-1b676f70c108cda90cf9d114d16c677584400efc.tar.xz
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.c25
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: