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| author | Geert Uytterhoeven <geert+renesas@glider.be> | 2021-11-17 10:59:32 +0100 |
|---|---|---|
| committer | Geert Uytterhoeven <geert+renesas@glider.be> | 2021-11-19 10:55:21 +0100 |
| commit | 7c50a407b8687ae3589c740d2347d9ae73887889 (patch) | |
| tree | 9da243b23df732d1f66aa8727c128c39e5f9f5d0 /lib/string_helpers.c | |
| parent | adb613f84a9e3638dfcc85975c7d58a4e80eef02 (diff) | |
| download | linux-7c50a407b8687ae3589c740d2347d9ae73887889.tar.gz linux-7c50a407b8687ae3589c740d2347d9ae73887889.tar.bz2 linux-7c50a407b8687ae3589c740d2347d9ae73887889.zip | |
pinctrl: renesas: Remove unneeded locking around sh_pfc_read() calls
There is no need to acquire the spinlock when reading from a pin
controller register:
1. Reading a single MMIO register is an atomic operation,
2. While sh_pfc_phys_to_virt() inside sh_pfc_read() has to traverse
all mapped windows to find the appropriate virtual address, this
does not need any locking, as the window mappings are never
changed.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/2008ca99f0079fd5d4e640b7ef78710c98cc9f77.1637143108.git.geert+renesas@glider.be
Diffstat (limited to 'lib/string_helpers.c')
0 files changed, 0 insertions, 0 deletions