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Three fixes for 3.4:

Browse source 
- Fix a lock ordering deadlock in JFFS2
  - Fix an oops in the dataflash driver, triggered by a dummy call to test
    whether it has OTP functionality.
  - Fix request_mem_region() failure on amsdelta NAND driver.
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Merge tag 'for-linus-3.4-20120513' of git://git.infradead.org/linux-mtd

Pull three MTD fixes from David Woodhouse:
 - Fix a lock ordering deadlock in JFFS2
 - Fix an oops in the dataflash driver, triggered by a dummy call to test
   whether it has OTP functionality.
 - Fix request_mem_region() failure on amsdelta NAND driver.

* tag 'for-linus-3.4-20120513' of git://git.infradead.org/linux-mtd:
  mtd: ams-delta: fix request_mem_region() failure
  jffs2: Fix lock acquisition order bug in gc path
  mtd: fix oops in dataflash driver
This commit is contained in:
Linus Torvalds 2012-05-13 11:33:09 -07:00
commit 9ff00d58a9
3 changed files with 8 additions and 13 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
drivers/mtd/mtdchar.c
View file

@ -376,7 +376,7 @@ static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
* Make a fake call to mtd_read_fact_prot_reg() to check if OTP * Make a fake call to mtd_read_fact_prot_reg() to check if OTP
* operations are supported. * operations are supported.
*/ */
if (mtd_read_fact_prot_reg(mtd, -1, -1, &retlen, NULL) == -EOPNOTSUPP) if (mtd_read_fact_prot_reg(mtd, -1, 0, &retlen, NULL) == -EOPNOTSUPP)
return -EOPNOTSUPP; return -EOPNOTSUPP;
switch (mode) { switch (mode) {

17
drivers/mtd/nand/ams-delta.c
View file

@ -212,18 +212,17 @@ static int __devinit ams_delta_init(struct platform_device *pdev)
/* Link the private data with the MTD structure */ /* Link the private data with the MTD structure */
ams_delta_mtd->priv = this; ams_delta_mtd->priv = this;
if (!request_mem_region(res->start, resource_size(res), /*
dev_name(&pdev->dev))) { * Don't try to request the memory region from here,
dev_err(&pdev->dev, "request_mem_region failed\n"); * it should have been already requested from the
err = -EBUSY; * gpio-omap driver and requesting it again would fail.
goto out_free; */
}
io_base = ioremap(res->start, resource_size(res)); io_base = ioremap(res->start, resource_size(res));
if (io_base == NULL) { if (io_base == NULL) {
dev_err(&pdev->dev, "ioremap failed\n"); dev_err(&pdev->dev, "ioremap failed\n");
err = -EIO; err = -EIO;
goto out_release_io; goto out_free;
} }
this->priv = io_base; this->priv = io_base;
@ -271,8 +270,6 @@ out_gpio:
platform_set_drvdata(pdev, NULL); platform_set_drvdata(pdev, NULL);
gpio_free(AMS_DELTA_GPIO_PIN_NAND_RB); gpio_free(AMS_DELTA_GPIO_PIN_NAND_RB);
iounmap(io_base); iounmap(io_base);
out_release_io:
release_mem_region(res->start, resource_size(res));
out_free: out_free:
kfree(ams_delta_mtd); kfree(ams_delta_mtd);
out: out:
@ -285,7 +282,6 @@ out_free:
static int __devexit ams_delta_cleanup(struct platform_device *pdev) static int __devexit ams_delta_cleanup(struct platform_device *pdev)
{ {
void __iomem *io_base = platform_get_drvdata(pdev); void __iomem *io_base = platform_get_drvdata(pdev);
struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
/* Release resources, unregister device */ /* Release resources, unregister device */
nand_release(ams_delta_mtd); nand_release(ams_delta_mtd);
@ -293,7 +289,6 @@ static int __devexit ams_delta_cleanup(struct platform_device *pdev)
gpio_free_array(_mandatory_gpio, ARRAY_SIZE(_mandatory_gpio)); gpio_free_array(_mandatory_gpio, ARRAY_SIZE(_mandatory_gpio));
gpio_free(AMS_DELTA_GPIO_PIN_NAND_RB); gpio_free(AMS_DELTA_GPIO_PIN_NAND_RB);
iounmap(io_base); iounmap(io_base);
release_mem_region(res->start, resource_size(res));
/* Free the MTD device structure */ /* Free the MTD device structure */
kfree(ams_delta_mtd); kfree(ams_delta_mtd);

2
fs/jffs2/gc.c
View file

@ -234,8 +234,8 @@ int jffs2_garbage_collect_pass(struct jffs2_sb_info *c)
return 0; return 0;
jffs2_dbg(1, "No progress from erasing block; doing GC anyway\n"); jffs2_dbg(1, "No progress from erasing block; doing GC anyway\n");
spin_lock(&c->erase_completion_lock);
mutex_lock(&c->alloc_sem); mutex_lock(&c->alloc_sem);
spin_lock(&c->erase_completion_lock);
} }
/* First, work out which block we're garbage-collecting */ /* First, work out which block we're garbage-collecting */