On Thu, Apr 23, 2020 at 7:42 PM Dejin Zheng <zhengdejin5@xxxxxxxxx> wrote:
>
> A call of the function do_take_over_console() can fail here.
> The corresponding system resources were not released then.
> Thus add a call of iounmap() and release_mem_region()
> together with the check of a failure predicate. and also
> add release_mem_region() on device removal.
FWIW,
Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
> Fixes: e86bb8acc0fdc ("[PATCH] VT binding: Make newport_con support binding")
> Cc: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
> Suggested-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx>
> Signed-off-by: Dejin Zheng <zhengdejin5@xxxxxxxxx>
> ---
> v2 -> v3:
> - modify commit tag CC to Cc by Andy's suggestion.
> - modify Subject 'console: console:' to 'console: newport_con:'
> by Bartlomiej's suggestion.
> - add missing release_mem_region() on error and on device removal
> by Bartlomiej's suggestion.
> - add correct fixes commit, before this patch, add a wrong 'Fixes:
> e84de0c6190503 ("MIPS: GIO bus support for SGI IP22/28")'
> thanks Bartlomiej again!
>
> v1 -> v2:
> - modify the commit comments. The commit comments have some more
> appropriate instructions by Markus'suggestion. here is my first
> version commit comments:
>
> if do_take_over_console() return an error in the newport_probe(),
> due to the io virtual address is not released, it will cause a
> leak.
>
> drivers/video/console/newport_con.c | 12 ++++++++++--
> 1 file changed, 10 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/video/console/newport_con.c b/drivers/video/console/newport_con.c
> index 00dddf6e08b0..2d2ee17052e8 100644
> --- a/drivers/video/console/newport_con.c
> +++ b/drivers/video/console/newport_con.c
> @@ -32,6 +32,8 @@
> #include <linux/linux_logo.h>
> #include <linux/font.h>
>
> +#define NEWPORT_LEN 0x10000
> +
> #define FONT_DATA ((unsigned char *)font_vga_8x16.data)
>
> /* borrowed from fbcon.c */
> @@ -43,6 +45,7 @@
> static unsigned char *font_data[MAX_NR_CONSOLES];
>
> static struct newport_regs *npregs;
> +static unsigned long newport_addr;
>
> static int logo_active;
> static int topscan;
> @@ -702,7 +705,6 @@ const struct consw newport_con = {
> static int newport_probe(struct gio_device *dev,
> const struct gio_device_id *id)
> {
> - unsigned long newport_addr;
> int err;
>
> if (!dev->resource.start)
> @@ -712,7 +714,7 @@ static int newport_probe(struct gio_device *dev,
> return -EBUSY; /* we only support one Newport as console */
>
> newport_addr = dev->resource.start + 0xF0000;
> - if (!request_mem_region(newport_addr, 0x10000, "Newport"))
> + if (!request_mem_region(newport_addr, NEWPORT_LEN, "Newport"))
> return -ENODEV;
>
> npregs = (struct newport_regs *)/* ioremap cannot fail */
> @@ -720,6 +722,11 @@ static int newport_probe(struct gio_device *dev,
> console_lock();
> err = do_take_over_console(&newport_con, 0, MAX_NR_CONSOLES - 1, 1);
> console_unlock();
> +
> + if (err) {
> + iounmap((void *)npregs);
> + release_mem_region(newport_addr, NEWPORT_LEN);
> + }
> return err;
> }
>
> @@ -727,6 +734,7 @@ static void newport_remove(struct gio_device *dev)
> {
> give_up_console(&newport_con);
> iounmap((void *)npregs);
> + release_mem_region(newport_addr, NEWPORT_LEN);
> }
>
> static struct gio_device_id newport_ids[] = {
> --
> 2.25.0
>
--
With Best Regards,
Andy Shevchenko
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