[PATCH v5 3/5] tpm: Convert tpm_find_get_ops() to use tpm_default_chip()
From: Stefan Berger <hidden>
Date: 2018-06-26 11:07:19
Also in:
linux-integrity, lkml
Subsystem:
the rest, tpm device driver · Maintainers:
Linus Torvalds, Peter Huewe, Jarkko Sakkinen
Convert tpm_find_get_ops() to use tpm_default_chip() in case no chip is passed in. Signed-off-by: Stefan Berger <redacted> --- drivers/char/tpm/tpm-chip.c | 32 +++++++++++++------------------- 1 file changed, 13 insertions(+), 19 deletions(-)
diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index f551061262c9..b01d34983766 100644
--- a/drivers/char/tpm/tpm-chip.c
+++ b/drivers/char/tpm/tpm-chip.c@@ -124,29 +124,23 @@ EXPORT_SYMBOL_GPL(tpm_default_chip); */ struct tpm_chip *tpm_find_get_ops(struct tpm_chip *chip) { - struct tpm_chip *res = NULL; - int chip_num = 0; - int chip_prev; - - mutex_lock(&idr_lock); + int rc; - if (!chip) { - do { - chip_prev = chip_num; - chip = idr_get_next(&dev_nums_idr, &chip_num); - if (chip && !tpm_try_get_ops(chip)) { - res = chip; - break; - } - } while (chip_prev != chip_num); - } else { + if (chip) { if (!tpm_try_get_ops(chip)) - res = chip; + return chip; + return NULL; } - mutex_unlock(&idr_lock); - - return res; + chip = tpm_default_chip(); + if (!chip) + return NULL; + rc = tpm_try_get_ops(chip); + /* release additional reference we got from tpm_default_chip() */ + put_device(&chip->dev); + if (!rc) + return NULL; + return chip; } /**
--
2.17.1
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