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| author | Takashi Iwai <tiwai@suse.de> | 2019-05-20 11:26:43 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-06-10 19:20:36 +0200 |
| commit | ddaf29fd9bb6a8192153bc097615765d202b0ab3 (patch) | |
| tree | 645a403be079231588e7b34bbd4edf8298df2020 /drivers/base | |
| parent | 64ae0e71c60dc4bd3a59ae709b807f96f68df495 (diff) | |
| download | linux-0-day-ddaf29fd9bb6a8192153bc097615765d202b0ab3.tar.gz linux-0-day-ddaf29fd9bb6a8192153bc097615765d202b0ab3.tar.xz | |
firmware: Free temporary page table after vmapping
Once after performing vmap() to map the S/G pages, our own page table
becomes superfluous since the pages can be released via vfree()
automatically. Let's change the buffer release code and discard the
page table array for saving some memory.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/firmware_loader/fallback.c | 7 | ||||
| -rw-r--r-- | drivers/base/firmware_loader/main.c | 6 |
2 files changed, 9 insertions, 4 deletions
diff --git a/drivers/base/firmware_loader/fallback.c b/drivers/base/firmware_loader/fallback.c index f962488546b63..a0a1856aac846 100644 --- a/drivers/base/firmware_loader/fallback.c +++ b/drivers/base/firmware_loader/fallback.c @@ -222,7 +222,7 @@ static ssize_t firmware_loading_show(struct device *dev, /* one pages buffer should be mapped/unmapped only once */ static int map_fw_priv_pages(struct fw_priv *fw_priv) { - if (!fw_priv->is_paged_buf) + if (!fw_priv->pages) return 0; vunmap(fw_priv->data); @@ -230,6 +230,11 @@ static int map_fw_priv_pages(struct fw_priv *fw_priv) PAGE_KERNEL_RO); if (!fw_priv->data) return -ENOMEM; + + /* page table is no longer needed after mapping, let's free */ + vfree(fw_priv->pages); + fw_priv->pages = NULL; + return 0; } diff --git a/drivers/base/firmware_loader/main.c b/drivers/base/firmware_loader/main.c index 7eaaf5ee5ba6b..aed1a7c567132 100644 --- a/drivers/base/firmware_loader/main.c +++ b/drivers/base/firmware_loader/main.c @@ -252,13 +252,13 @@ static void __free_fw_priv(struct kref *ref) spin_unlock(&fwc->lock); #ifdef CONFIG_FW_LOADER_USER_HELPER - if (fw_priv->is_paged_buf) { + if (fw_priv->pages) { + /* free leftover pages */ int i; - vunmap(fw_priv->data); for (i = 0; i < fw_priv->nr_pages; i++) __free_page(fw_priv->pages[i]); vfree(fw_priv->pages); - } else + } #endif if (!fw_priv->allocated_size) vfree(fw_priv->data); |