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| author | Matt Porter <mporter@linaro.org> | 2014-04-10 15:22:10 -0400 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2014-04-11 11:31:13 +0800 |
| commit | eb4a5346e777784f1b5ae9fd0c29b96344bdc3ae (patch) | |
| tree | 9803168c7b40fd074d3140436547a58c6c0365dd /arch | |
| parent | 59ecc26004e77e100c700b1d0da7502b0fdadb46 (diff) | |
| download | linux-eb4a5346e777784f1b5ae9fd0c29b96344bdc3ae.tar.gz | |
hwrng: bcm2835 - fix oops when rng h/w is accessed during registration
Commit "d9e7972 hwrng: add randomness to system from rng sources" exposed a bug in the bcm2835-rng driver resulting in boot failure on Raspberry Pi due to the following oops: [ 28.261523] BUG: soft lockup - CPU#0 stuck for 23s! [swapper:1] [ 28.271058] [ 28.275958] CPU: 0 PID: 1 Comm: swapper Not tainted 3.14.0+ #11 [ 28.285374] task: db480000 ti: db484000 task.ti: db484000 [ 28.294279] PC is at bcm2835_rng_read+0x28/0x48 [ 28.302276] LR is at hwrng_register+0x1a8/0x238 . . . The RNG h/w is not completely initialized and enabled before hwrng_register() is called and so the bcm2835_rng_read() fails. Fix this by making the warmup/enable writes before registering the RNG source with the hwrng core. Signed-off-by: Matt Porter <mporter@linaro.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'arch')
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