[MTD] mtdoops: allow MTD selection by name (e2a0f25b) · Commits · 戴 / test

MTD's have both an index number and a name. Formerly, the MTD selected for mtdoops was done only by index number. With this patch, a name can be used instead. For example, the kernel command line: console=ttyMTD5 selects MTD 5 for mtdoops. But now this is also possible: console=ttyMTD,log which selects the MTD named "log" for mtdoops. This has the advantage that partitions can be added or removed that would affect the MTD index number but not the name, without having to then change the kernel command line. Signed-off-by:

Adrian Hunter <ext-adrian.hunter@nokia.com> Acked-by:

Richard Purdie <rpurdie@linux.intel.com> Acked-by:

Artem Bityutskiy <Artem.Bityutskiy@nokia.com> Signed-off-by:

David Woodhouse <David.Woodhouse@intel.com>

drivers/mtd/mtdoops.c

+10 −1

Original line number	Diff line number	Diff line
		@@ -44,6 +44,7 @@ static struct mtdoops_context {
		int oops_pages;
		int nextpage;
		int nextcount;
		char *name;

		void *oops_buf;

		@@ -273,6 +274,9 @@ static void mtdoops_notify_add(struct mtd_info *mtd)
		{
		struct mtdoops_context *cxt = &oops_cxt;

		if (cxt->name && !strcmp(mtd->name, cxt->name))
		cxt->mtd_index = mtd->index;

		if ((mtd->index != cxt->mtd_index) \|\| cxt->mtd_index < 0)
		return;

		@@ -383,8 +387,12 @@ static int __init mtdoops_console_setup(struct console co, char options)
		{
		struct mtdoops_context *cxt = co->data;

		if (cxt->mtd_index != -1)
		if (cxt->mtd_index != -1 \|\| cxt->name)
		return -EBUSY;
		if (options) {
		cxt->name = kstrdup(options, GFP_KERNEL);
		return 0;
		}
		if (co->index == -1)
		return -EINVAL;

		@@ -432,6 +440,7 @@ static void __exit mtdoops_console_exit(void)

		unregister_mtd_user(&mtdoops_notifier);
		unregister_console(&mtdoops_console);
		kfree(cxt->name);
		vfree(cxt->oops_buf);
		}

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